At a glance
Vacation, unpaid sales time, tools, tax and bad debt need a line — not vibes.
This guide is written for readers in United States using USD. Pair it with the calculators below so numbers and narrative stay consistent.
## Billable hours are not 40
Assume 50–70% utilization after admin and hunting work. Target net lifestyle from Net salary thinking, then gross-up with Self-employment tax and downtime. Freelance developer day-rate calculator and Contractor day rate are starting points, not gospel.
## Runway before the big client
Cash runway months tells you how long you can say no to a bad rate. Invoice with Invoice with tax and written scope. Scope creep is an unpaid second job.
---
Note: Educational content from Calcly United States. Official sources (IRS / SSA — educational federal model; state tax not fully modeled.) and licensed professionals take priority in United States.
Key takeaways
- • Treat every number as an estimate until it matches your payslip, bank quote, or official form.
- • Change one input at a time so you know which lever moves the result.
- • Use related calculators to complete the decision chain (income → tax → housing/credit → savings).
- • For United States, prefer local defaults and USD amounts over foreign templates.